NWS Forecast for Affton MO

National Weather Service Forecast for: Affton MO
Issued by: National Weather Service Saint Louis, MO

Updated: 3:41 am CDT Jul 25, 2025

Today Mostly Sunny then Slight Chance T-storms	Tonight Slight Chance T-storms then Partly Cloudy	Saturday Slight Chance Showers then Chance T-storms	Saturday Night Slight Chance T-storms	Sunday Sunny then Chance T-storms	Sunday Night Mostly Clear	Monday Hot	Monday Night Mostly Clear	Tuesday Hot
Hi 94 °F	Lo 77 °F	Hi 95 °F	Lo 77 °F	Hi 96 °F	Lo 79 °F	Hi 99 °F	Lo 80 °F	Hi 99 °F

Extreme Heat Warning
Hazardous Weather Outlook

Today	A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Southeast wind 3 to 6 mph.
Tonight	A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 77. South wind 3 to 6 mph.
Saturday	A slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Heat index values as high as 110. South wind 3 to 7 mph. Chance of precipitation is 30%.
Saturday Night	A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77. South wind 3 to 6 mph.
Sunday	A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night	Mostly clear, with a low around 79.
Monday	Sunny and hot, with a high near 99.
Monday Night	Mostly clear, with a low around 80.
Tuesday	Sunny and hot, with a high near 99.
Tuesday Night	Mostly clear, with a low around 78.
Wednesday	A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Wednesday Night	A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Thursday	A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.

Forecast from NOAA-NWS for Affton MO.